<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../vue.global.js"></script>
</head>

<body>
    <div id="app">{{count}}</div>

    <script>
        // 应用程序实例
        const app = Vue.createApp(
            {
                data() {
                    return { 
                        count: 4 
                    }
                }
            }
        )

        // 根组件实例/Vue引擎实例
        const vm = app.mount('#app')

        console.log(vm,vm.count) // => 4
    </script>
</body>

</html>